Risk assessment of cypermethrin residue in suburban agriculture: a case study of Brassica Juncea (L.) and its growing soil | |
| Author | Chinh Thi Nguyen |
| Call Number | AIT Thesis no.EV-11-19 |
| Subject(s) | Pesticides--Environmental aspects--Vietnam Pyrethrins |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | Cypermethrin, a synthetic pyrithroid pesticide, used for controlling various insecticides, rapidly degrades in soil environment, known as a friendly environment pesticide, has been used popularly in the developing countries like Vietnam and other countries in Southeast Asia. A commercial pesticide product names Sec Sai Gon at 10% W/V with the main ingredient is cypermethrin was obtained from a local market in Thanh Hoa province, Vietnam and was used through in this study. The soil in the experimental plot is almost neutral with pH at 6.76, has quite high organic matter (7.63%) and clay soil type (64% clay). The field experiment was followed the design of RCBD, including three replicates and each of the blocks contains three treatments(T1, T2, and T3). In the treatment 1, there was no pesticide applied, or the dose of cypermethrin applied in this treatment was 0g/ha. For treatment 2 and 3, the doses applied were 25g/ha and 75g/ha respectively. To avoid the contamination of cypermethrin from the higher doses to the lower doses, treatment 1 and 2 were covered by plastic sheets on the top and the surrounding before and after spraying 2 hours for every time the pesticide was applied. In addition of receiving amount of rainfall, the vegetable was watered once per day. The soil and vegetable were collected to analyze in laboratory. In this study, it was figured out that the cypermethrin residues in both soil and vegetable samples are depended on the doses of cypermethrin applied to. Also, tap water has no effect in taking away the cypermethrin adhered in the vegetable while washing. The time remained that cypermethrin residue in the soil needs to degrade 50% found is varied from 5-11 days and to degrade 90% is from 19-20 days. An acute toxicity test also was conducted on Vietnamese native earthworms in laboratory to check the effect of cypermethrin on the organisms in the soil. The median lethal concentration was found is at 1.02mg/cm². |
| Year | 2011 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Preeda Pakpian; |
| Examination Committee(s) | Nguyen, Thi Kim Oanh;Shipin, Oleg V.; |
| Scholarship Donor(s) | Thanh Hoa Scholarship;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2011 |